冲头对层合板低能量冲击损伤有限元模拟精度的影响
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摘要
为探索冲头对低能量冲击损伤有限元模拟精度的影响,基于连续损伤力学模型,采用基于应变的Hashin失效准则,并利用VUMAT子程序实现刚度折减,建立了预测复合材料层合板低能量冲击损伤的数值模型;并选用圆形和锥形冲头进行了落锤低能量冲击试验,测量了冲击损伤形貌。研究结果表明:低能量冲击条件下,模型可以较为准确的预测损伤深度及面积,但相较于圆形冲头,锥形冲头的预测精确度更高,且在25J≥冲击能量≥15J时,模型预测精度更高。
In order to investigate the effect of a plunger on the precision of numerical simulation of low energy impact damage, a numerical model with a user material subroutine(VUMAT)was established for predicating the damage of low energy impact on composite laminates based on continuum damage mechanics(CDM) and Hashin failure criterion. Comparing with the damage dimension of the low energy impact experiments, the results show that the damage dimension of the low energy impact can be predicted well using numerical simulation model. It is also found the prediction precision is higher when the plunger is tapered or the energy of impact is between 15 J and 25 J.
In order to investigate the effect of a plunger on the precision of numerical simulation of low energy impact damage, a numerical model with a user material subroutine(VUMAT)was established for predicating the damage of low energy impact on composite laminates based on continuum damage mechanics(CDM) and Hashin failure criterion. Comparing with the damage dimension of the low energy impact experiments, the results show that the damage dimension of the low energy impact can be predicted well using numerical simulation model. It is also found the prediction precision is higher when the plunger is tapered or the energy of impact is between 15 J and 25 J.
引文
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[5]陈勇,庞宝军,郑伟,等.纤维金属层合板低速冲击试验和数值仿真[J].复合材料学报,2014,31(3):733-740.
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[2]杨光松.损伤力学与复合材料损伤[M].北京:国防工业出版社,1995.
[3]Tiberkak R.Bachene M.,Rechak S.,et al.Damage prediction in composite plates subjected to low velocity impact[J].Compos Struct,2008,83(1):73-82.
[4]毛春见,许希武,田静,等.缝合复合材料层板低速冲击损伤研究[J].固体力学学报,2011,32(1):43-56.
[5]陈勇,庞宝军,郑伟,等.纤维金属层合板低速冲击试验和数值仿真[J].复合材料学报,2014,31(3):733-740.
[6]屈天骄,郑锡涛,范献银,等.复合材料层合板低速冲击损伤影响因素分析[J].航空材料学报,2011,31(6):81-86.
[7]吴义韬,姚卫星,吴富强.复合材料层合板面内渐进损伤分析的CDM模型[J].力学学报,2014,46(1):94-104.
[8]朱炜垚,许希武.复合材料层合板低速冲击损伤的有限元模拟[J].复合材料学报,2010,27(6):200-207.